在花芽分化和发育前期,荔枝、龙眼同一朵花中雌雄一起分化发育,到开花前20-25天才决定每朵花的雌雄性别,性别决定有较大可塑性。花穗的雌雄比例受环境温度高低、体内营养状况和激素水平综合影响。笔者经多年观察试验发现,下列措施能提高雌花比例。 Differentiation and development in flower buds early, litchi, longan with the same flower in the male and female differentiation and development, to flowering 20-25 days before deciding each flower of male and female, gender decided to have greater plasticity. The ratio of male and female spikes by the ambient temperature level, the nutritional status of the body and the combined effects of hormone levels. After years of observation and experiment, I found that the following measures can increase the proportion of female flowers.